    <!DOCTYPE html>  
    <html lang="en">  
    <head>  
      <meta charset="UTF-8">  
      <title>Document</title>  
      <style type="text/css">  
      *{  
        margin: 0;  
        padding: 0;  
      }     
      li{  
        width: 50px;  
        height: 50px;  
        background: #18A15E;  
        display: inline-block;  
      }  
      
      </style>  
    </head>  
    <body>    
      <div class="wrap">  
        <ul>  
            <li></li>  
            <li></li>  
            <li></li>  
            <li></li>  
        </ul>  
      </div>  
    </body>  
    </html>  
